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Remove enforce_nand.

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This commit is contained in:
Sean Bowe 2018-02-23 11:24:42 -07:00
parent 0d56c7a902
commit a45986ff97
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GPG Key ID: 95684257D8F8B031
1 changed files with 28 additions and 93 deletions
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121
src/circuit/boolean.rs
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@ -366,7 +366,34 @@ impl Boolean {
{ {
let c = Self::xor(&mut cs, a, b)?; let c = Self::xor(&mut cs, a, b)?;
Self::enforce_nand(&mut cs, &[c]) match c {
Boolean::Constant(false) => {
Ok(())
},
Boolean::Constant(true) => {
Err(SynthesisError::Unsatisfiable)
},
Boolean::Is(ref res) => {
cs.enforce(
|| "enforce equals zero",
|lc| lc,
|lc| lc,
|lc| lc + res.get_variable()
);
Ok(())
},
Boolean::Not(ref res) => {
cs.enforce(
|| "enforce equals one",
|lc| lc,
|lc| lc,
|lc| lc + CS::one() - res.get_variable()
);
Ok(())
},
}
} }
pub fn get_value(&self) -> Option<bool> { pub fn get_value(&self) -> Option<bool> {
@ -491,46 +518,6 @@ impl Boolean {
Ok(cur) Ok(cur)
} }
/// Asserts that at least one operand is false.
pub fn enforce_nand<E, CS>(
mut cs: CS,
bits: &[Self]
) -> Result<(), SynthesisError>
where E: Engine,
CS: ConstraintSystem<E>
{
let res = Self::kary_and(&mut cs, bits)?;
match res {
Boolean::Constant(false) => {
Ok(())
},
Boolean::Constant(true) => {
Err(SynthesisError::Unsatisfiable)
},
Boolean::Is(ref res) => {
cs.enforce(
|| "enforce nand",
|lc| lc,
|lc| lc,
|lc| lc + res.get_variable()
);
Ok(())
},
Boolean::Not(ref res) => {
cs.enforce(
|| "enforce nand",
|lc| lc,
|lc| lc,
|lc| lc + CS::one() - res.get_variable()
);
Ok(())
},
}
}
} }
impl From<AllocatedBit> for Boolean { impl From<AllocatedBit> for Boolean {
@ -1018,58 +1005,6 @@ mod test {
} }
} }
#[test]
fn test_enforce_nand() {
{
let mut cs = TestConstraintSystem::<Bls12>::new();
Boolean::enforce_nand(&mut cs, &[Boolean::constant(false)]).is_ok();
Boolean::enforce_nand(&mut cs, &[Boolean::constant(true)]).is_err();
}
for i in 1..5 {
// with every possible assignment for them
for mut b in 0..(1 << i) {
// with every possible negation
for mut n in 0..(1 << i) {
let mut cs = TestConstraintSystem::<Bls12>::new();
let mut expected = true;
let mut bits = vec![];
for j in 0..i {
expected &= b & 1 == 1;
if n & 1 == 1 {
bits.push(Boolean::from(AllocatedBit::alloc(
cs.namespace(|| format!("bit {}", j)),
Some(b & 1 == 1)
).unwrap()));
} else {
bits.push(Boolean::from(AllocatedBit::alloc(
cs.namespace(|| format!("bit {}", j)),
Some(b & 1 == 0)
).unwrap()).not());
}
b >>= 1;
n >>= 1;
}
let expected = !expected;
Boolean::enforce_nand(&mut cs, &bits).unwrap();
if expected {
assert!(cs.is_satisfied());
} else {
assert!(!cs.is_satisfied());
}
}
}
}
}
#[test] #[test]
fn test_kary_and() { fn test_kary_and() {
// test different numbers of operands // test different numbers of operands